21632644543 has 2 divisors, whose sum is σ = 21632644544. Its totient is φ = 21632644542.

The previous prime is 21632644531. The next prime is 21632644547. The reversal of 21632644543 is 34544623612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21632644543 - 2¹⁷ = 21632513471 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21632644496 and 21632644505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21632644547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10816322271 + 10816322272.

It is an arithmetic number, because the mean of its divisors is an integer number (10816322272).

Almost surely, 2^21632644543 is an apocalyptic number.

21632644543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21632644543 is an equidigital number, since it uses as much as digits as its factorization.

21632644543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 40.

The spelling of 21632644543 in words is "twenty-one billion, six hundred thirty-two million, six hundred forty-four thousand, five hundred forty-three".